* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-box {
    background: #ffffff;
    border-radius: 16px;
    padding: 40px 32px;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.logo-container {
    text-align: center;
    margin-bottom: 32px;
}

.logo-3d {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.logo-3d:hover {
    transform: scale(1.05);
}

.login-title {
    text-align: center;
    color: #2d3748;
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 28px;
    letter-spacing: -0.3px;
}

.login-form {
    width: 100%;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: #4a5568;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid #e2e8f0;
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.2s ease;
    background: #fff;
    color: #2d3748;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.08);
}

.form-control::placeholder {
    color: #a0aec0;
}

.btn-login {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 8px;
    position: relative;
}

.btn-login:hover:not(:disabled) {
    background: #5a67d8;
    transform: translateY(-1px);
}

.btn-login:active:not(:disabled) {
    transform: translateY(0);
}

.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.error-message {
    background: #fed7d7;
    border: 1px solid #fc8181;
    color: #c53030;
    padding: 10px 12px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
    animation: fadeIn 0.3s ease;
}

@media (max-width: 480px) {
    .login-box {
        padding: 32px 24px;
    }
    
    .logo-3d {
        width: 80px;
        height: 80px;
    }
    
    .login-title {
        font-size: 20px;
    }
}